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Appendix VL

shewing that when steam is blown over incandescent carbon, in
due proportions; the resulting gas consists mainly of hydrogen and
carbon monoxide. Speaking correctly, the CO in the last equation
is the true producer gas, and the final mixture should be called
water gas. This is next burnt in the engine by the addition of ri 3
volumes of air to one of gas, the heat produced being due to the
formation of CO2 and H2O.

Dowson and Lencauchez have both designed Pressure Pro-
ducers^ almost identical in their organs; the Lencauchez plant
being described on p. 914. A small boiler is required in addition,
to supply the necessary steam. Suction Producers are of a much
simpler character, and are being built for the smaller-sized engines
down to 10 JLP. The fuel is either coke or anthracite, so as to
avoid tar, and the economy is much greater than with lighting gas,
but not so great as with Mond or blast-furnace gases, described
later. Anthracite at 225-. per ton will provide one B.H.P. hour
for T\, while Mond gas gives the same power for -fad. Fig.
1619 is a section through Crossley's suction-producer, where A is

Ft&JO19.   Crass Jay's S^ofiorv